You cannot directly convert .spb files to .sbu. You would have to recover the contacts saved in .spb file using Samsung Kies and then proceed to again backup your device (not only contacts) to pro a .sbu file. There doesn't seem to be any other way to do this conversion, although it is not conversion in proper sense.
Convert Samsung Kies exported phone contacts library to Samsung Kies backup.
We have found 2 software records in our database eligible for .spb to .sbu file format conversion.
Microsoft Windows software - convert spb to sbu on Windows
A free software developed by Samsung for communication between latest Samsung devices. It is used for data backup, data transfer between portable device and pc, multimedia management, firmware upgrade and much more.
Convert from spb file
|Yes, Samsung Kies supports spb file conversion as a source file type.||Yes||Yes||spb editor||Yes||No||No||No|
to sbu file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned spb to sbu. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert spb to sbu on OS X
Samsung Kies for Mac allows users to back up, copy, and transfer content stored on Samsung smart phone or tablet with Mac, and other devices with a simple click and drag.